Temperature and humidity measurement and control of our lives, and industrial production, weather forecast, material warehousing plays a very important role. On many occasions, and in a timely and accurate temperature, humidity, obtain the objective information is very important, in recent years, the rapid development of temperature and humidity control field, and with the development of digital technology, the temperature and humidity control chip and corresponding on the stage of history, in industry, agriculture, etc can be widely used in various fields.
In this paper, the temperature and humidity of the program based on single-chip microcomputer system for the related research. The single-chip microcomputer control system is achieved through the surrounding environment of temperature and humidity measurements. AT89S52 SCM system based on the control unit, the temperature and humidity sensor for detecting device for main SHT7X, temperature, humidity measurement, display, control, and the use of communication between the microcontroller will be collected by the temperature and humidity in the displayed in the LCD screen. Temperature measurement range for - 40 ° c ~ + 123.8 ° c, accuracy ± 0.4, Humidity measurement range for: 0 ~ 100% RH, accuracy ± : 3.0% RH.
This paper through the soft, organic combination of hardware, hardware-based, the preparation of the functional modules. Papers on the work of system hardware principle of a simple description, each accompanied by a diagram of the system hardware design. And the detailed description of LCD display screen, SHT7X and AT89S52 devices such as external interface circuit hardware and software debugging, processes and procedures to achieve process.
Keywords: temperature and humidity control, SCM system, The LCD screen
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